I would like to change a file the opens with Windows Media Player to a MIDI file. I've attempted to just add .midi and the end of the file name, but that doesnt do anything. please help!!Have a  read:

http://www.google.com/search?hl=en&sa=X&oi=spell&resnum=0&ct=result&cd=1&q=wav+to+midi+converter&spell=1

<---------------You're unlikely to com across much in the way of free software that does this, and with any software, the results of CONVERTING from wave FORMAT to multi-voice midi format are never going to be that satisfactory.  From a computer's point of view, it is a ridiculously complcated task, to separate out one sound from another and work out which pitch each sound is at.  Something a trained musician can do easily.  Hah.  No substitute for the human brain.  

Anyway, such software does EXIST, but don't expect miracles.  And since a lot of development is required for this kind of thing, don't expect the software to be cheap.  I dare say there are some open source projects of this nature out there, but I haven't come across them,  You could try a search at SourceForge or FreshMeat. Quote

e. I've attempted to just add .midi and the end of the file name, but that doesnt do anything.